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| author | Andrew Jones <drjones@redhat.com> | 2020-08-04 19:06:02 +0200 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-08-21 14:04:14 +0100 |
| commit | 53f985584e3c2ebe5f2455530fbf87a001528db8 (patch) | |
| tree | 7ad5be2d2651d8ebc4595c784a13d43b7e6a5a2c /include | |
| parent | 4d2d4ce001f283ed8127173543b4cfb65641e357 (diff) | |
| download | linux-stable-53f985584e3c2ebe5f2455530fbf87a001528db8.tar.gz linux-stable-53f985584e3c2ebe5f2455530fbf87a001528db8.tar.bz2 linux-stable-53f985584e3c2ebe5f2455530fbf87a001528db8.zip | |
KVM: arm64: pvtime: Fix stolen time accounting across migration
When updating the stolen time we should always read the current
stolen time from the user provided memory, not from a kernel
cache. If we use a cache then we'll end up resetting stolen time
to zero on the first update after migration.
Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200804170604.42662-5-drjones@redhat.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/kvm_host.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 84371fb06209..05e3c2fb3ef7 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -749,6 +749,26 @@ int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, gpa_t gpa, unsigned long len); +#define __kvm_get_guest(kvm, gfn, offset, v) \ +({ \ + unsigned long __addr = gfn_to_hva(kvm, gfn); \ + typeof(v) __user *__uaddr = (typeof(__uaddr))(__addr + offset); \ + int __ret = -EFAULT; \ + \ + if (!kvm_is_error_hva(__addr)) \ + __ret = get_user(v, __uaddr); \ + __ret; \ +}) + +#define kvm_get_guest(kvm, gpa, v) \ +({ \ + gpa_t __gpa = gpa; \ + struct kvm *__kvm = kvm; \ + \ + __kvm_get_guest(__kvm, __gpa >> PAGE_SHIFT, \ + offset_in_page(__gpa), v); \ +}) + #define __kvm_put_guest(kvm, gfn, offset, v) \ ({ \ unsigned long __addr = gfn_to_hva(kvm, gfn); \ |